PR modula2/120389 ICE if assigning a constant char to an integer array

PR modula2/120389 ICE if assigning a constant char to an integer array

This patch fixes an ICE which occurs if a constant char is assigned
into an integer array.  The fix it to introduce type checking in
M2GenGCC.mod:CodeXIndr.

gcc/m2/ChangeLog:

	PR modula2/120389
	* gm2-compiler/M2GenGCC.mod (CodeXIndr): Check to see that
	the type of left is assignment compatible with the type of
	right.

gcc/testsuite/ChangeLog:

	PR modula2/120389
	* gm2/iso/fail/badarray3.mod: New test.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>